How to use RedisTemplate.execute(SessionCallback) without type issues?

Question

Here's my basic example setup:

private final RedisTemplate<String, Object> redisTemplate;
public void save(Object thing, Instant expiresAt) {
 redisTemplate.execute(new SessionCallback<Void>() {
 @Override
 public @Nullable Void execute(@NonNull RedisOperations ops) throws DataAccessException {
 ops.opsForValue("key", thing);
 ops.expireAt("key", expiresAt);
 return null;
 }
 });
}

That version compiles, but has multiple warnings for

Unchecked call to ... as a member of raw type ...

These attempts all fail to compile:

redisTemplate.execute((SessionCallback<Void>) ops -> {
 ops.opsForValue("key", thing);
 ops.expireAt("key", expiresAt);
 return null;
});

Target method is generic

redisTemplate.execute(new SessionCallback<Void>() {
 @Override
 public @Nullable Void execute(@NonNull RedisOperations<String, Object> ops) throws DataAccessException {
 ops.opsForValue("key", thing);
 ops.expireAt("key", expiresAt);
 return null;
 }
});

Class 'Anonymous class derived from SessionCallback' must implement abstract method 'execute(RedisOperations<K, V>)' in 'SessionCallback'

redisTemplate.execute(new SessionCallback<Void>() {
 @Override
 public <K, V> @Nullable Void execute(@NonNull RedisOperations<K, V> ops) throws DataAccessException {
 ops.opsForValue("key", thing);
 ops.expireAt("key", expiresAt);
 return null;
 }
});

Required type 'T', provided 'String'
Cannot resolve method 'expireAt(String, Instant)'

And finally, compiling with warnings:

redisTemplate.execute(new SessionCallback<Void>() {
 @Override
 public <K, V> @Nullable Void execute(@NonNull RedisOperations<K, V> ops) throws DataAccessException {
 ops.opsForValue((K) "key", (V) thing);
 ops.expireAt((K) "key", (V) expiresAt);
 return null;
 }
});

Unchecked cast: 'java.lang.String' to 'K'

Is it actually possible to use this API without type warnings or errors?

• M. Deinum: You don't. There are several issues registered for this in the Spring Data Redis repository.
• OrangeDog: Ah yes, github.com/spring-projects/spring-data-redis/issues/815 from 2013...